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Question

Which of the following is a regulatory protein for muscles?

A
Tubulin
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B
Tropomyosin
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C
Myosin
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D
All the above
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Solution

The correct option is B Tropomyosin
Troponin is attached to the protein tropomyosin and lies within the groove between actin filaments in muscle tissue. In a relaxed muscle, tropomyosin blocks the attachment site for the myosin crossbridge, thus preventing contraction. Tropomyosin needs to be displaced from this attachment for contraction to occur.

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